Abstract
EUKARYOTIC ribosomal RNAs are post-transcriptionally modified by methylation at the ribose sugar of specific nucleotides1. This takes place in the nucleolus and involves a family of small nucleolar RNAs (snoRNAs) with long regions (10–21 nucleotides) complementary to rRNA sequences spanning the methylation site2–4—a complementary snoRNA is required for methylation at a specific site5. Here we show that altering the sequence of the snoRNA is sufficient to change the specificity of methylation. Mammalian cells transfected with a snoRNA engineered to be complementary to an arbitrary rRNA sequence direct the methylation of the predicted nucleotide in that sequence. We have further identified structural features, both of the guide and substrate RNA, required for methylation and have used these to design an exogenous transcript, devoid of rRNA sequence, that is site-specifically methylated when co-expressed with an appropriate guide snoRNA. Endogenous non-ribosomal RNA can thus be targeted, possibly providing a highly selective tool for the alteration of gene expression at the post-transcriptional level.
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Cavaillé, J., Nicoloso, M. & Bachellerie, JP. Targeted ribose methylation of RNA in vivo directed by tailored antisense RNA guides. Nature 383, 732–735 (1996). https://doi.org/10.1038/383732a0
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DOI: https://doi.org/10.1038/383732a0
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